Innominate:
Eureka (I think). That looks very much like the beast (assuming memory functions still working correctly after nearly 50 years), although probably slightly smaller but with a really big weapons bay. I seem to remember it didn't get through to the second stage because it was too wide for the taxiways at any of the CC stations at that stage (St Mawgan, Ballykelly, Kinloss, Luqa and Changi, let alone Gibraltar) thus incurring even more rebuilding costs.
Also many thanks for the heads up on the book - I'm off down that South American river forthwith!